Letta vs 
AG2
Letta vs AG2 compared for 2026 — features, license, ease of use, performance and which one to choose. Stateful agents with long-term memory vs The community continuation of AutoGen.
Updated regularly · curated by OpenSourceAI.tech
Letta vs AG2 at a glance
| Spec | Letta | AG2 |
|---|---|---|
| Category | AI agent framework | AI agent framework |
| Type | Agent runtime (memory) | Multi-agent framework |
| License | Apache-2.0 | Apache-2.0 |
| Runs locally | Self-hosted | Cloud-optional |
| Primary language | Python | Python |
| Ease of use | Advanced | Intermediate |
| Best for | agents that remember across sessions | teams invested in the AutoGen conversation model |
| GitHub stars | 23.8k | 4.8k |
How Letta and AG2 score
| Criterion | Letta | AG2 |
|---|---|---|
| Popularity | 3.5 | 2.5 |
| Maintenance | 5.0 | 5.0 |
| Ease of use | 2.5 | 3.5 |
| Privacy | 4.5 | 3.5 |
| License freedom | 5.0 | 5.0 |
Scores are computed automatically from public signals — GitHub stars (popularity), recent commit activity (maintenance), license type (freedom), local-first design (privacy) and onboarding complexity (ease of use). Indicative, not a verdict.
What each one is
Letta
Letta (formerly MemGPT) is a framework and server for building stateful agents with long-term memory that persists across sessions, with a visual agent editor.
- Persistent long-term agent memory
- Server with REST API and visual editor
- Model-agnostic and self-hostable
AG2
AG2 is the community-driven continuation of AutoGen, focused on multi-agent conversations and orchestration with an open governance model.
- Continuity for the AutoGen ecosystem
- Community-governed, Apache-2.0
- Mature multi-agent conversation patterns
Key differences
Letta is agent runtime (memory), while AG2 is multi-agent framework. Letta leans more advanced-friendly, whereas AG2 is more suited to intermediate users. They also differ in how they run (Self-hosted vs Cloud-optional). In short, Letta fits agents that remember across sessions, and AG2 fits teams invested in the AutoGen conversation model.
Which should you choose?
Choose Letta for agents that remember across sessions. Choose AG2 for teams invested in the AutoGen conversation model.
There is rarely one winner — many setups use both. The right pick depends on your hardware, your team's skills, and whether you value simplicity or control.
Frequently asked questions
Is Letta or AG2 easier to use?
AG2 is generally the easier of the two to get started with, while Letta rewards more setup with more control.
Are Letta and AG2 free?
Letta is free and open source (Apache-2.0), and AG2 is free and open source (Apache-2.0). Neither charges for the core software.
Can I run Letta and AG2 locally?
Letta: self-hosted · AG2: cloud-optional. Both can be used without sending your data to a third-party cloud where their setup allows.
Letta vs AG2 — which should I pick in 2026?
Choose Letta for agents that remember across sessions. Choose AG2 for teams invested in the AutoGen conversation model.
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